CVE-2026-73334
Description
A flaw was found in Apache Parquet Hadoop. When processing a Parquet file, if the Key Management Service (KMS) Uniform Resource Locator (URL) is controlled by the file and not explicitly set by the application, a vulnerability can arise. An attacker could craft a malicious Parquet file to direct a KMS token to an arbitrary malicious server if the client implementation does not validate the host. This could lead to the unauthorized disclosure of sensitive KMS tokens.
Statement
Red Hat is aware of this vulnerability in Apache Parquet Java. The issue affects applications that use file-controlled KMS URLs when reading encrypted Parquet files with a custom KMS client that does not validate the destination host. Red Hat rates this vulnerability as Moderate.
Mitigation
Upgrade Apache Parquet Java to version 1.18.1 or later, which disables file-controlled KMS URLs by default. Until upgraded, applications should use an application-controlled KMS URL when reading encrypted Parquet files. If application control is not possible, validate the file-controlled KMS URL and use authentication in the custom KMS client implementation.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 8.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Access Control
Technical Impact: Bypass Protection Mechanism
By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
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